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55 lines
1.6 KiB
55 lines
1.6 KiB
2 years ago
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//
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// LTEasing.swift
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// LTMorphingLabelDemo
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//
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// Created by Lex on 7/1/14.
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// Copyright (c) 2015 lexrus.com. All rights reserved.
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//
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import Foundation
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// http://gsgd.co.uk/sandbox/jquery/easing/jquery.easing.1.3.js
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// t = currentTime
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// b = beginning
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// c = change
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// d = duration
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public struct LTEasing {
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public static func easeOutQuint(_ t: Float, _ b: Float, _ c: Float, _ d: Float = 1.0) -> Float {
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return { (f: Float) in
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return c * (pow(f, 5) + 1.0) + b
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}(t / d - 1.0)
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}
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public static func easeInQuint(_ t: Float, _ b: Float, _ c: Float, _ d: Float = 1.0) -> Float {
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return { (f: Float) in
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c * pow(f, 5) + b
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}(t / d)
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}
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public static func easeOutBack(_ t: Float, _ b: Float, _ c: Float, _ d: Float = 1.0) -> Float {
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let s: Float = 2.70158
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let t2: Float = t / d - 1.0
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return Float(c * (t2 * t2 * ((s + 1.0) * t2 + s) + 1.0)) + b
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}
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public static func easeOutBounce(_ t: Float, _ b: Float, _ c: Float, _ d: Float = 1.0) -> Float {
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return { (f: Float) in
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if f < 1 / 2.75 {
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return c * 7.5625 * f * f + b
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} else if f < 2 / 2.75 {
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let t = f - 1.5 / 2.75
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return c * (7.5625 * t * t + 0.75) + b
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} else if f < 2.5 / 2.75 {
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let t = f - 2.25 / 2.75
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return c * (7.5625 * t * t + 0.9375) + b
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} else {
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let t = f - 2.625 / 2.75
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return c * (7.5625 * t * t + 0.984375) + b
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}
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}(t / d)
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}
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}
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